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When ClutterGLXTexturePixmap uses GL_ARB_texture_rectangle, it needs to pass the right internal format (GL_RGB or GL_RGBA) when it initializes the texture with glTexImage2D() or later handling won't recognize the alpha channel. http://bugzilla.openedhand.com/show_bug.cgi?id=1586 Signed-off-by: Robert Bragg <robert@linux.intel.com>